Why won’t .filter() work in Internet Explorer 8?

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Array.filter() isn’t included in IE until version 9.

You could use this to implement it:

if (!Array.prototype.filter)
{
  Array.prototype.filter = function(fun /*, thisp */)
  {
    "use strict";

    if (this === void 0 || this === null)
      throw new TypeError();

    var t = Object(this);
    var len = t.length >>> 0;
    if (typeof fun !== "function")
      throw new TypeError();

    var res = [];
    var thisp = arguments[1];
    for (var i = 0; i < len; i++)
    {
      if (i in t)
      {
        var val = t[i]; // in case fun mutates this
        if (fun.call(thisp, val, i, t))
          res.push(val);
      }
    }

    return res;
  };
}

From: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/filter

Or since you are using jQuery, you can wrap your array into a jQuery object first:

songs = $(songs).filter(function(){
  return this.album==album;
});

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